If so, did your doctor draw blood and test these
levels during a tilt? That can be very informative. If it helps at all, my
levels were, pre-tilt: Dopamine - less than 20, Epinephrine - 25, Norepinephrine - 316; during tilt: Dopamine - less than 20, Epinephrine - less than 10, Norepinephrine - 258. These were all normal, and also showed that my syncope was not at all related to anxiety or other chemical imbalance, because the amounts were normal and actually went down during tilt.